Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/rand/rand_win.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | /* ==================================================================== |
| 59 | * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved. |
| 60 | * |
| 61 | * Redistribution and use in source and binary forms, with or without |
| 62 | * modification, are permitted provided that the following conditions |
| 63 | * are met: |
| 64 | * |
| 65 | * 1. Redistributions of source code must retain the above copyright |
| 66 | * notice, this list of conditions and the following disclaimer. |
| 67 | * |
| 68 | * 2. Redistributions in binary form must reproduce the above copyright |
| 69 | * notice, this list of conditions and the following disclaimer in |
| 70 | * the documentation and/or other materials provided with the |
| 71 | * distribution. |
| 72 | * |
| 73 | * 3. All advertising materials mentioning features or use of this |
| 74 | * software must display the following acknowledgment: |
| 75 | * "This product includes software developed by the OpenSSL Project |
| 76 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" |
| 77 | * |
| 78 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 79 | * endorse or promote products derived from this software without |
| 80 | * prior written permission. For written permission, please contact |
| 81 | * openssl-core@openssl.org. |
| 82 | * |
| 83 | * 5. Products derived from this software may not be called "OpenSSL" |
| 84 | * nor may "OpenSSL" appear in their names without prior written |
| 85 | * permission of the OpenSSL Project. |
| 86 | * |
| 87 | * 6. Redistributions of any form whatsoever must retain the following |
| 88 | * acknowledgment: |
| 89 | * "This product includes software developed by the OpenSSL Project |
| 90 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" |
| 91 | * |
| 92 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 93 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 94 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 95 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 96 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 97 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 98 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 99 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 100 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 101 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 102 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 103 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 104 | * ==================================================================== |
| 105 | * |
| 106 | * This product includes cryptographic software written by Eric Young |
| 107 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 108 | * Hudson (tjh@cryptsoft.com). |
| 109 | * |
| 110 | */ |
| 111 | |
| 112 | #include "cryptlib.h" |
| 113 | #include <openssl/rand.h> |
| 114 | #include "rand_lcl.h" |
| 115 | |
| 116 | #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) |
| 117 | #include <windows.h> |
| 118 | #ifndef _WIN32_WINNT |
| 119 | # define _WIN32_WINNT 0x0400 |
| 120 | #endif |
| 121 | #include <wincrypt.h> |
| 122 | #include <tlhelp32.h> |
| 123 | |
| 124 | /* Limit the time spent walking through the heap, processes, threads and modules to |
| 125 | a maximum of 1000 miliseconds each, unless CryptoGenRandom failed */ |
| 126 | #define MAXDELAY 1000 |
| 127 | |
| 128 | /* Intel hardware RNG CSP -- available from |
| 129 | * http://developer.intel.com/design/security/rng/redist_license.htm |
| 130 | */ |
| 131 | #define PROV_INTEL_SEC 22 |
| 132 | #define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider" |
| 133 | |
| 134 | static void readtimer(void); |
| 135 | static void readscreen(void); |
| 136 | |
| 137 | /* It appears like CURSORINFO, PCURSORINFO and LPCURSORINFO are only defined |
| 138 | when WINVER is 0x0500 and up, which currently only happens on Win2000. |
| 139 | Unfortunately, those are typedefs, so they're a little bit difficult to |
| 140 | detect properly. On the other hand, the macro CURSOR_SHOWING is defined |
| 141 | within the same conditional, so it can be use to detect the absence of said |
| 142 | typedefs. */ |
| 143 | |
| 144 | #ifndef CURSOR_SHOWING |
| 145 | /* |
| 146 | * Information about the global cursor. |
| 147 | */ |
| 148 | typedef struct tagCURSORINFO |
| 149 | { |
| 150 | DWORD cbSize; |
| 151 | DWORD flags; |
| 152 | HCURSOR hCursor; |
| 153 | POINT ptScreenPos; |
| 154 | } CURSORINFO, *PCURSORINFO, *LPCURSORINFO; |
| 155 | |
| 156 | #define CURSOR_SHOWING 0x00000001 |
| 157 | #endif /* CURSOR_SHOWING */ |
| 158 | |
| 159 | #if !defined(OPENSSL_SYS_WINCE) |
| 160 | typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTW)(HCRYPTPROV *, LPCWSTR, LPCWSTR, |
| 161 | DWORD, DWORD); |
| 162 | typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV, DWORD, BYTE *); |
| 163 | typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV, DWORD); |
| 164 | |
| 165 | typedef HWND (WINAPI *GETFOREGROUNDWINDOW)(VOID); |
| 166 | typedef BOOL (WINAPI *GETCURSORINFO)(PCURSORINFO); |
| 167 | typedef DWORD (WINAPI *GETQUEUESTATUS)(UINT); |
| 168 | |
| 169 | typedef HANDLE (WINAPI *CREATETOOLHELP32SNAPSHOT)(DWORD, DWORD); |
| 170 | typedef BOOL (WINAPI *CLOSETOOLHELP32SNAPSHOT)(HANDLE); |
| 171 | typedef BOOL (WINAPI *HEAP32FIRST)(LPHEAPENTRY32, DWORD, size_t); |
| 172 | typedef BOOL (WINAPI *HEAP32NEXT)(LPHEAPENTRY32); |
| 173 | typedef BOOL (WINAPI *HEAP32LIST)(HANDLE, LPHEAPLIST32); |
| 174 | typedef BOOL (WINAPI *PROCESS32)(HANDLE, LPPROCESSENTRY32); |
| 175 | typedef BOOL (WINAPI *THREAD32)(HANDLE, LPTHREADENTRY32); |
| 176 | typedef BOOL (WINAPI *MODULE32)(HANDLE, LPMODULEENTRY32); |
| 177 | |
| 178 | #include <lmcons.h> |
| 179 | #include <lmstats.h> |
| 180 | #if 1 /* The NET API is Unicode only. It requires the use of the UNICODE |
| 181 | * macro. When UNICODE is defined LPTSTR becomes LPWSTR. LMSTR was |
| 182 | * was added to the Platform SDK to allow the NET API to be used in |
| 183 | * non-Unicode applications provided that Unicode strings were still |
| 184 | * used for input. LMSTR is defined as LPWSTR. |
| 185 | */ |
| 186 | typedef NET_API_STATUS (NET_API_FUNCTION * NETSTATGET) |
| 187 | (LPWSTR, LPWSTR, DWORD, DWORD, LPBYTE*); |
| 188 | typedef NET_API_STATUS (NET_API_FUNCTION * NETFREE)(LPBYTE); |
| 189 | #endif /* 1 */ |
| 190 | #endif /* !OPENSSL_SYS_WINCE */ |
| 191 | |
| 192 | int RAND_poll(void) |
| 193 | { |
| 194 | MEMORYSTATUS m; |
| 195 | HCRYPTPROV hProvider = 0; |
| 196 | DWORD w; |
| 197 | int good = 0; |
| 198 | |
| 199 | /* Determine the OS version we are on so we can turn off things |
| 200 | * that do not work properly. |
| 201 | */ |
| 202 | OSVERSIONINFO osverinfo ; |
| 203 | osverinfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO) ; |
| 204 | GetVersionEx( &osverinfo ) ; |
| 205 | |
| 206 | #if defined(OPENSSL_SYS_WINCE) |
| 207 | # if defined(_WIN32_WCE) && _WIN32_WCE>=300 |
| 208 | /* Even though MSDN says _WIN32_WCE>=210, it doesn't seem to be available |
| 209 | * in commonly available implementations prior 300... */ |
| 210 | { |
| 211 | BYTE buf[64]; |
| 212 | /* poll the CryptoAPI PRNG */ |
| 213 | /* The CryptoAPI returns sizeof(buf) bytes of randomness */ |
| 214 | if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL, |
| 215 | CRYPT_VERIFYCONTEXT)) |
| 216 | { |
| 217 | if (CryptGenRandom(hProvider, sizeof(buf), buf)) |
| 218 | RAND_add(buf, sizeof(buf), sizeof(buf)); |
| 219 | CryptReleaseContext(hProvider, 0); |
| 220 | } |
| 221 | } |
| 222 | # endif |
| 223 | #else /* OPENSSL_SYS_WINCE */ |
| 224 | /* |
| 225 | * None of below libraries are present on Windows CE, which is |
| 226 | * why we #ifndef the whole section. This also excuses us from |
| 227 | * handling the GetProcAddress issue. The trouble is that in |
| 228 | * real Win32 API GetProcAddress is available in ANSI flavor |
| 229 | * only. In WinCE on the other hand GetProcAddress is a macro |
| 230 | * most commonly defined as GetProcAddressW, which accepts |
| 231 | * Unicode argument. If we were to call GetProcAddress under |
| 232 | * WinCE, I'd recommend to either redefine GetProcAddress as |
| 233 | * GetProcAddressA (there seem to be one in common CE spec) or |
| 234 | * implement own shim routine, which would accept ANSI argument |
| 235 | * and expand it to Unicode. |
| 236 | */ |
| 237 | { |
| 238 | /* load functions dynamically - not available on all systems */ |
| 239 | HMODULE advapi = LoadLibrary(TEXT("ADVAPI32.DLL")); |
| 240 | HMODULE kernel = LoadLibrary(TEXT("KERNEL32.DLL")); |
| 241 | HMODULE user = NULL; |
| 242 | HMODULE netapi = LoadLibrary(TEXT("NETAPI32.DLL")); |
| 243 | CRYPTACQUIRECONTEXTW acquire = NULL; |
| 244 | CRYPTGENRANDOM gen = NULL; |
| 245 | CRYPTRELEASECONTEXT release = NULL; |
| 246 | NETSTATGET netstatget = NULL; |
| 247 | NETFREE netfree = NULL; |
| 248 | BYTE buf[64]; |
| 249 | |
| 250 | if (netapi) |
| 251 | { |
| 252 | netstatget = (NETSTATGET) GetProcAddress(netapi,"NetStatisticsGet"); |
| 253 | netfree = (NETFREE) GetProcAddress(netapi,"NetApiBufferFree"); |
| 254 | } |
| 255 | |
| 256 | if (netstatget && netfree) |
| 257 | { |
| 258 | LPBYTE outbuf; |
| 259 | /* NetStatisticsGet() is a Unicode only function |
| 260 | * STAT_WORKSTATION_0 contains 45 fields and STAT_SERVER_0 |
| 261 | * contains 17 fields. We treat each field as a source of |
| 262 | * one byte of entropy. |
| 263 | */ |
| 264 | |
| 265 | if (netstatget(NULL, L"LanmanWorkstation", 0, 0, &outbuf) == 0) |
| 266 | { |
| 267 | RAND_add(outbuf, sizeof(STAT_WORKSTATION_0), 45); |
| 268 | netfree(outbuf); |
| 269 | } |
| 270 | if (netstatget(NULL, L"LanmanServer", 0, 0, &outbuf) == 0) |
| 271 | { |
| 272 | RAND_add(outbuf, sizeof(STAT_SERVER_0), 17); |
| 273 | netfree(outbuf); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | if (netapi) |
| 278 | FreeLibrary(netapi); |
| 279 | |
| 280 | /* It appears like this can cause an exception deep within ADVAPI32.DLL |
| 281 | * at random times on Windows 2000. Reported by Jeffrey Altman. |
| 282 | * Only use it on NT. |
| 283 | */ |
| 284 | /* Wolfgang Marczy <WMarczy@topcall.co.at> reports that |
| 285 | * the RegQueryValueEx call below can hang on NT4.0 (SP6). |
| 286 | * So we don't use this at all for now. */ |
| 287 | #if 0 |
| 288 | if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT && |
| 289 | osverinfo.dwMajorVersion < 5) |
| 290 | { |
| 291 | /* Read Performance Statistics from NT/2000 registry |
| 292 | * The size of the performance data can vary from call |
| 293 | * to call so we must guess the size of the buffer to use |
| 294 | * and increase its size if we get an ERROR_MORE_DATA |
| 295 | * return instead of ERROR_SUCCESS. |
| 296 | */ |
| 297 | LONG rc=ERROR_MORE_DATA; |
| 298 | char * buf=NULL; |
| 299 | DWORD bufsz=0; |
| 300 | DWORD length; |
| 301 | |
| 302 | while (rc == ERROR_MORE_DATA) |
| 303 | { |
| 304 | buf = realloc(buf,bufsz+8192); |
| 305 | if (!buf) |
| 306 | break; |
| 307 | bufsz += 8192; |
| 308 | |
| 309 | length = bufsz; |
| 310 | rc = RegQueryValueEx(HKEY_PERFORMANCE_DATA, TEXT("Global"), |
| 311 | NULL, NULL, buf, &length); |
| 312 | } |
| 313 | if (rc == ERROR_SUCCESS) |
| 314 | { |
| 315 | /* For entropy count assume only least significant |
| 316 | * byte of each DWORD is random. |
| 317 | */ |
| 318 | RAND_add(&length, sizeof(length), 0); |
| 319 | RAND_add(buf, length, length / 4.0); |
| 320 | |
| 321 | /* Close the Registry Key to allow Windows to cleanup/close |
| 322 | * the open handle |
| 323 | * Note: The 'HKEY_PERFORMANCE_DATA' key is implicitly opened |
| 324 | * when the RegQueryValueEx above is done. However, if |
| 325 | * it is not explicitly closed, it can cause disk |
| 326 | * partition manipulation problems. |
| 327 | */ |
| 328 | RegCloseKey(HKEY_PERFORMANCE_DATA); |
| 329 | } |
| 330 | if (buf) |
| 331 | free(buf); |
| 332 | } |
| 333 | #endif |
| 334 | |
| 335 | if (advapi) |
| 336 | { |
| 337 | /* |
| 338 | * If it's available, then it's available in both ANSI |
| 339 | * and UNICODE flavors even in Win9x, documentation says. |
| 340 | * We favor Unicode... |
| 341 | */ |
| 342 | acquire = (CRYPTACQUIRECONTEXTW) GetProcAddress(advapi, |
| 343 | "CryptAcquireContextW"); |
| 344 | gen = (CRYPTGENRANDOM) GetProcAddress(advapi, |
| 345 | "CryptGenRandom"); |
| 346 | release = (CRYPTRELEASECONTEXT) GetProcAddress(advapi, |
| 347 | "CryptReleaseContext"); |
| 348 | } |
| 349 | |
| 350 | if (acquire && gen && release) |
| 351 | { |
| 352 | /* poll the CryptoAPI PRNG */ |
| 353 | /* The CryptoAPI returns sizeof(buf) bytes of randomness */ |
| 354 | if (acquire(&hProvider, NULL, NULL, PROV_RSA_FULL, |
| 355 | CRYPT_VERIFYCONTEXT)) |
| 356 | { |
| 357 | if (gen(hProvider, sizeof(buf), buf) != 0) |
| 358 | { |
| 359 | RAND_add(buf, sizeof(buf), 0); |
| 360 | good = 1; |
| 361 | #if 0 |
| 362 | printf("randomness from PROV_RSA_FULL\n"); |
| 363 | #endif |
| 364 | } |
| 365 | release(hProvider, 0); |
| 366 | } |
| 367 | |
| 368 | /* poll the Pentium PRG with CryptoAPI */ |
| 369 | if (acquire(&hProvider, 0, INTEL_DEF_PROV, PROV_INTEL_SEC, 0)) |
| 370 | { |
| 371 | if (gen(hProvider, sizeof(buf), buf) != 0) |
| 372 | { |
| 373 | RAND_add(buf, sizeof(buf), sizeof(buf)); |
| 374 | good = 1; |
| 375 | #if 0 |
| 376 | printf("randomness from PROV_INTEL_SEC\n"); |
| 377 | #endif |
| 378 | } |
| 379 | release(hProvider, 0); |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | if (advapi) |
| 384 | FreeLibrary(advapi); |
| 385 | |
| 386 | if ((osverinfo.dwPlatformId != VER_PLATFORM_WIN32_NT || |
| 387 | !OPENSSL_isservice()) && |
| 388 | (user = LoadLibrary(TEXT("USER32.DLL")))) |
| 389 | { |
| 390 | GETCURSORINFO cursor; |
| 391 | GETFOREGROUNDWINDOW win; |
| 392 | GETQUEUESTATUS queue; |
| 393 | |
| 394 | win = (GETFOREGROUNDWINDOW) GetProcAddress(user, "GetForegroundWindow"); |
| 395 | cursor = (GETCURSORINFO) GetProcAddress(user, "GetCursorInfo"); |
| 396 | queue = (GETQUEUESTATUS) GetProcAddress(user, "GetQueueStatus"); |
| 397 | |
| 398 | if (win) |
| 399 | { |
| 400 | /* window handle */ |
| 401 | HWND h = win(); |
| 402 | RAND_add(&h, sizeof(h), 0); |
| 403 | } |
| 404 | if (cursor) |
| 405 | { |
| 406 | /* unfortunately, its not safe to call GetCursorInfo() |
| 407 | * on NT4 even though it exists in SP3 (or SP6) and |
| 408 | * higher. |
| 409 | */ |
| 410 | if ( osverinfo.dwPlatformId == VER_PLATFORM_WIN32_NT && |
| 411 | osverinfo.dwMajorVersion < 5) |
| 412 | cursor = 0; |
| 413 | } |
| 414 | if (cursor) |
| 415 | { |
| 416 | /* cursor position */ |
| 417 | /* assume 2 bytes of entropy */ |
| 418 | CURSORINFO ci; |
| 419 | ci.cbSize = sizeof(CURSORINFO); |
| 420 | if (cursor(&ci)) |
| 421 | RAND_add(&ci, ci.cbSize, 2); |
| 422 | } |
| 423 | |
| 424 | if (queue) |
| 425 | { |
| 426 | /* message queue status */ |
| 427 | /* assume 1 byte of entropy */ |
| 428 | w = queue(QS_ALLEVENTS); |
| 429 | RAND_add(&w, sizeof(w), 1); |
| 430 | } |
| 431 | |
| 432 | FreeLibrary(user); |
| 433 | } |
| 434 | |
| 435 | /* Toolhelp32 snapshot: enumerate processes, threads, modules and heap |
| 436 | * http://msdn.microsoft.com/library/psdk/winbase/toolhelp_5pfd.htm |
| 437 | * (Win 9x and 2000 only, not available on NT) |
| 438 | * |
| 439 | * This seeding method was proposed in Peter Gutmann, Software |
| 440 | * Generation of Practically Strong Random Numbers, |
| 441 | * http://www.usenix.org/publications/library/proceedings/sec98/gutmann.html |
| 442 | * revised version at http://www.cryptoengines.com/~peter/06_random.pdf |
| 443 | * (The assignment of entropy estimates below is arbitrary, but based |
| 444 | * on Peter's analysis the full poll appears to be safe. Additional |
| 445 | * interactive seeding is encouraged.) |
| 446 | */ |
| 447 | |
| 448 | if (kernel) |
| 449 | { |
| 450 | CREATETOOLHELP32SNAPSHOT snap; |
| 451 | CLOSETOOLHELP32SNAPSHOT close_snap; |
| 452 | HANDLE handle; |
| 453 | |
| 454 | HEAP32FIRST heap_first; |
| 455 | HEAP32NEXT heap_next; |
| 456 | HEAP32LIST heaplist_first, heaplist_next; |
| 457 | PROCESS32 process_first, process_next; |
| 458 | THREAD32 thread_first, thread_next; |
| 459 | MODULE32 module_first, module_next; |
| 460 | |
| 461 | HEAPLIST32 hlist; |
| 462 | HEAPENTRY32 hentry; |
| 463 | PROCESSENTRY32 p; |
| 464 | THREADENTRY32 t; |
| 465 | MODULEENTRY32 m; |
| 466 | DWORD starttime = 0; |
| 467 | |
| 468 | snap = (CREATETOOLHELP32SNAPSHOT) |
| 469 | GetProcAddress(kernel, "CreateToolhelp32Snapshot"); |
| 470 | close_snap = (CLOSETOOLHELP32SNAPSHOT) |
| 471 | GetProcAddress(kernel, "CloseToolhelp32Snapshot"); |
| 472 | heap_first = (HEAP32FIRST) GetProcAddress(kernel, "Heap32First"); |
| 473 | heap_next = (HEAP32NEXT) GetProcAddress(kernel, "Heap32Next"); |
| 474 | heaplist_first = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListFirst"); |
| 475 | heaplist_next = (HEAP32LIST) GetProcAddress(kernel, "Heap32ListNext"); |
| 476 | process_first = (PROCESS32) GetProcAddress(kernel, "Process32First"); |
| 477 | process_next = (PROCESS32) GetProcAddress(kernel, "Process32Next"); |
| 478 | thread_first = (THREAD32) GetProcAddress(kernel, "Thread32First"); |
| 479 | thread_next = (THREAD32) GetProcAddress(kernel, "Thread32Next"); |
| 480 | module_first = (MODULE32) GetProcAddress(kernel, "Module32First"); |
| 481 | module_next = (MODULE32) GetProcAddress(kernel, "Module32Next"); |
| 482 | |
| 483 | if (snap && heap_first && heap_next && heaplist_first && |
| 484 | heaplist_next && process_first && process_next && |
| 485 | thread_first && thread_next && module_first && |
| 486 | module_next && (handle = snap(TH32CS_SNAPALL,0)) |
| 487 | != INVALID_HANDLE_VALUE) |
| 488 | { |
| 489 | /* heap list and heap walking */ |
| 490 | /* HEAPLIST32 contains 3 fields that will change with |
| 491 | * each entry. Consider each field a source of 1 byte |
| 492 | * of entropy. |
| 493 | * HEAPENTRY32 contains 5 fields that will change with |
| 494 | * each entry. Consider each field a source of 1 byte |
| 495 | * of entropy. |
| 496 | */ |
| 497 | ZeroMemory(&hlist, sizeof(HEAPLIST32)); |
| 498 | hlist.dwSize = sizeof(HEAPLIST32); |
| 499 | if (good) starttime = GetTickCount(); |
| 500 | #ifdef _MSC_VER |
| 501 | if (heaplist_first(handle, &hlist)) |
| 502 | { |
| 503 | /* |
| 504 | following discussion on dev ML, exception on WinCE (or other Win |
| 505 | platform) is theoretically of unknown origin; prevent infinite |
| 506 | loop here when this theoretical case occurs; otherwise cope with |
| 507 | the expected (MSDN documented) exception-throwing behaviour of |
| 508 | Heap32Next() on WinCE. |
| 509 | |
| 510 | based on patch in original message by Tanguy Fautré (2009/03/02) |
| 511 | Subject: RAND_poll() and CreateToolhelp32Snapshot() stability |
| 512 | */ |
| 513 | int ex_cnt_limit = 42; |
| 514 | do |
| 515 | { |
| 516 | RAND_add(&hlist, hlist.dwSize, 3); |
| 517 | __try |
| 518 | { |
| 519 | ZeroMemory(&hentry, sizeof(HEAPENTRY32)); |
| 520 | hentry.dwSize = sizeof(HEAPENTRY32); |
| 521 | if (heap_first(&hentry, |
| 522 | hlist.th32ProcessID, |
| 523 | hlist.th32HeapID)) |
| 524 | { |
| 525 | int entrycnt = 80; |
| 526 | do |
| 527 | RAND_add(&hentry, |
| 528 | hentry.dwSize, 5); |
| 529 | while (heap_next(&hentry) |
| 530 | && (!good || (GetTickCount()-starttime)<MAXDELAY) |
| 531 | && --entrycnt > 0); |
| 532 | } |
| 533 | } |
| 534 | __except (EXCEPTION_EXECUTE_HANDLER) |
| 535 | { |
| 536 | /* ignore access violations when walking the heap list */ |
| 537 | ex_cnt_limit--; |
| 538 | } |
| 539 | } while (heaplist_next(handle, &hlist) |
| 540 | && (!good || (GetTickCount()-starttime)<MAXDELAY) |
| 541 | && ex_cnt_limit > 0); |
| 542 | } |
| 543 | |
| 544 | #else |
| 545 | if (heaplist_first(handle, &hlist)) |
| 546 | { |
| 547 | do |
| 548 | { |
| 549 | RAND_add(&hlist, hlist.dwSize, 3); |
| 550 | hentry.dwSize = sizeof(HEAPENTRY32); |
| 551 | if (heap_first(&hentry, |
| 552 | hlist.th32ProcessID, |
| 553 | hlist.th32HeapID)) |
| 554 | { |
| 555 | int entrycnt = 80; |
| 556 | do |
| 557 | RAND_add(&hentry, |
| 558 | hentry.dwSize, 5); |
| 559 | while (heap_next(&hentry) |
| 560 | && --entrycnt > 0); |
| 561 | } |
| 562 | } while (heaplist_next(handle, &hlist) |
| 563 | && (!good || (GetTickCount()-starttime)<MAXDELAY)); |
| 564 | } |
| 565 | #endif |
| 566 | |
| 567 | /* process walking */ |
| 568 | /* PROCESSENTRY32 contains 9 fields that will change |
| 569 | * with each entry. Consider each field a source of |
| 570 | * 1 byte of entropy. |
| 571 | */ |
| 572 | p.dwSize = sizeof(PROCESSENTRY32); |
| 573 | |
| 574 | if (good) starttime = GetTickCount(); |
| 575 | if (process_first(handle, &p)) |
| 576 | do |
| 577 | RAND_add(&p, p.dwSize, 9); |
| 578 | while (process_next(handle, &p) && (!good || (GetTickCount()-starttime)<MAXDELAY)); |
| 579 | |
| 580 | /* thread walking */ |
| 581 | /* THREADENTRY32 contains 6 fields that will change |
| 582 | * with each entry. Consider each field a source of |
| 583 | * 1 byte of entropy. |
| 584 | */ |
| 585 | t.dwSize = sizeof(THREADENTRY32); |
| 586 | if (good) starttime = GetTickCount(); |
| 587 | if (thread_first(handle, &t)) |
| 588 | do |
| 589 | RAND_add(&t, t.dwSize, 6); |
| 590 | while (thread_next(handle, &t) && (!good || (GetTickCount()-starttime)<MAXDELAY)); |
| 591 | |
| 592 | /* module walking */ |
| 593 | /* MODULEENTRY32 contains 9 fields that will change |
| 594 | * with each entry. Consider each field a source of |
| 595 | * 1 byte of entropy. |
| 596 | */ |
| 597 | m.dwSize = sizeof(MODULEENTRY32); |
| 598 | if (good) starttime = GetTickCount(); |
| 599 | if (module_first(handle, &m)) |
| 600 | do |
| 601 | RAND_add(&m, m.dwSize, 9); |
| 602 | while (module_next(handle, &m) |
| 603 | && (!good || (GetTickCount()-starttime)<MAXDELAY)); |
| 604 | if (close_snap) |
| 605 | close_snap(handle); |
| 606 | else |
| 607 | CloseHandle(handle); |
| 608 | |
| 609 | } |
| 610 | |
| 611 | FreeLibrary(kernel); |
| 612 | } |
| 613 | } |
| 614 | #endif /* !OPENSSL_SYS_WINCE */ |
| 615 | |
| 616 | /* timer data */ |
| 617 | readtimer(); |
| 618 | |
| 619 | /* memory usage statistics */ |
| 620 | GlobalMemoryStatus(&m); |
| 621 | RAND_add(&m, sizeof(m), 1); |
| 622 | |
| 623 | /* process ID */ |
| 624 | w = GetCurrentProcessId(); |
| 625 | RAND_add(&w, sizeof(w), 1); |
| 626 | |
| 627 | #if 0 |
| 628 | printf("Exiting RAND_poll\n"); |
| 629 | #endif |
| 630 | |
| 631 | return(1); |
| 632 | } |
| 633 | |
| 634 | int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam) |
| 635 | { |
| 636 | double add_entropy=0; |
| 637 | |
| 638 | switch (iMsg) |
| 639 | { |
| 640 | case WM_KEYDOWN: |
| 641 | { |
| 642 | static WPARAM key; |
| 643 | if (key != wParam) |
| 644 | add_entropy = 0.05; |
| 645 | key = wParam; |
| 646 | } |
| 647 | break; |
| 648 | case WM_MOUSEMOVE: |
| 649 | { |
| 650 | static int lastx,lasty,lastdx,lastdy; |
| 651 | int x,y,dx,dy; |
| 652 | |
| 653 | x=LOWORD(lParam); |
| 654 | y=HIWORD(lParam); |
| 655 | dx=lastx-x; |
| 656 | dy=lasty-y; |
| 657 | if (dx != 0 && dy != 0 && dx-lastdx != 0 && dy-lastdy != 0) |
| 658 | add_entropy=.2; |
| 659 | lastx=x, lasty=y; |
| 660 | lastdx=dx, lastdy=dy; |
| 661 | } |
| 662 | break; |
| 663 | } |
| 664 | |
| 665 | readtimer(); |
| 666 | RAND_add(&iMsg, sizeof(iMsg), add_entropy); |
| 667 | RAND_add(&wParam, sizeof(wParam), 0); |
| 668 | RAND_add(&lParam, sizeof(lParam), 0); |
| 669 | |
| 670 | return (RAND_status()); |
| 671 | } |
| 672 | |
| 673 | |
| 674 | void RAND_screen(void) /* function available for backward compatibility */ |
| 675 | { |
| 676 | RAND_poll(); |
| 677 | readscreen(); |
| 678 | } |
| 679 | |
| 680 | |
| 681 | /* feed timing information to the PRNG */ |
| 682 | static void readtimer(void) |
| 683 | { |
| 684 | DWORD w; |
| 685 | LARGE_INTEGER l; |
| 686 | static int have_perfc = 1; |
| 687 | #if defined(_MSC_VER) && defined(_M_X86) |
| 688 | static int have_tsc = 1; |
| 689 | DWORD cyclecount; |
| 690 | |
| 691 | if (have_tsc) { |
| 692 | __try { |
| 693 | __asm { |
| 694 | _emit 0x0f |
| 695 | _emit 0x31 |
| 696 | mov cyclecount, eax |
| 697 | } |
| 698 | RAND_add(&cyclecount, sizeof(cyclecount), 1); |
| 699 | } __except(EXCEPTION_EXECUTE_HANDLER) { |
| 700 | have_tsc = 0; |
| 701 | } |
| 702 | } |
| 703 | #else |
| 704 | # define have_tsc 0 |
| 705 | #endif |
| 706 | |
| 707 | if (have_perfc) { |
| 708 | if (QueryPerformanceCounter(&l) == 0) |
| 709 | have_perfc = 0; |
| 710 | else |
| 711 | RAND_add(&l, sizeof(l), 0); |
| 712 | } |
| 713 | |
| 714 | if (!have_tsc && !have_perfc) { |
| 715 | w = GetTickCount(); |
| 716 | RAND_add(&w, sizeof(w), 0); |
| 717 | } |
| 718 | } |
| 719 | |
| 720 | /* feed screen contents to PRNG */ |
| 721 | /***************************************************************************** |
| 722 | * |
| 723 | * Created 960901 by Gertjan van Oosten, gertjan@West.NL, West Consulting B.V. |
| 724 | * |
| 725 | * Code adapted from |
| 726 | * <URL:http://support.microsoft.com/default.aspx?scid=kb;[LN];97193>; |
| 727 | * the original copyright message is: |
| 728 | * |
| 729 | * (C) Copyright Microsoft Corp. 1993. All rights reserved. |
| 730 | * |
| 731 | * You have a royalty-free right to use, modify, reproduce and |
| 732 | * distribute the Sample Files (and/or any modified version) in |
| 733 | * any way you find useful, provided that you agree that |
| 734 | * Microsoft has no warranty obligations or liability for any |
| 735 | * Sample Application Files which are modified. |
| 736 | */ |
| 737 | |
| 738 | static void readscreen(void) |
| 739 | { |
| 740 | #if !defined(OPENSSL_SYS_WINCE) && !defined(OPENSSL_SYS_WIN32_CYGWIN) |
| 741 | HDC hScrDC; /* screen DC */ |
| 742 | HDC hMemDC; /* memory DC */ |
| 743 | HBITMAP hBitmap; /* handle for our bitmap */ |
| 744 | HBITMAP hOldBitmap; /* handle for previous bitmap */ |
| 745 | BITMAP bm; /* bitmap properties */ |
| 746 | unsigned int size; /* size of bitmap */ |
| 747 | char *bmbits; /* contents of bitmap */ |
| 748 | int w; /* screen width */ |
| 749 | int h; /* screen height */ |
| 750 | int y; /* y-coordinate of screen lines to grab */ |
| 751 | int n = 16; /* number of screen lines to grab at a time */ |
| 752 | |
| 753 | if (GetVersion() < 0x80000000 && OPENSSL_isservice()>0) |
| 754 | return; |
| 755 | |
| 756 | /* Create a screen DC and a memory DC compatible to screen DC */ |
| 757 | hScrDC = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL); |
| 758 | hMemDC = CreateCompatibleDC(hScrDC); |
| 759 | |
| 760 | /* Get screen resolution */ |
| 761 | w = GetDeviceCaps(hScrDC, HORZRES); |
| 762 | h = GetDeviceCaps(hScrDC, VERTRES); |
| 763 | |
| 764 | /* Create a bitmap compatible with the screen DC */ |
| 765 | hBitmap = CreateCompatibleBitmap(hScrDC, w, n); |
| 766 | |
| 767 | /* Select new bitmap into memory DC */ |
| 768 | hOldBitmap = SelectObject(hMemDC, hBitmap); |
| 769 | |
| 770 | /* Get bitmap properties */ |
| 771 | GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm); |
| 772 | size = (unsigned int)bm.bmWidthBytes * bm.bmHeight * bm.bmPlanes; |
| 773 | |
| 774 | bmbits = OPENSSL_malloc(size); |
| 775 | if (bmbits) { |
| 776 | /* Now go through the whole screen, repeatedly grabbing n lines */ |
| 777 | for (y = 0; y < h-n; y += n) |
| 778 | { |
| 779 | unsigned char md[MD_DIGEST_LENGTH]; |
| 780 | |
| 781 | /* Bitblt screen DC to memory DC */ |
| 782 | BitBlt(hMemDC, 0, 0, w, n, hScrDC, 0, y, SRCCOPY); |
| 783 | |
| 784 | /* Copy bitmap bits from memory DC to bmbits */ |
| 785 | GetBitmapBits(hBitmap, size, bmbits); |
| 786 | |
| 787 | /* Get the hash of the bitmap */ |
| 788 | MD(bmbits,size,md); |
| 789 | |
| 790 | /* Seed the random generator with the hash value */ |
| 791 | RAND_add(md, MD_DIGEST_LENGTH, 0); |
| 792 | } |
| 793 | |
| 794 | OPENSSL_free(bmbits); |
| 795 | } |
| 796 | |
| 797 | /* Select old bitmap back into memory DC */ |
| 798 | hBitmap = SelectObject(hMemDC, hOldBitmap); |
| 799 | |
| 800 | /* Clean up */ |
| 801 | DeleteObject(hBitmap); |
| 802 | DeleteDC(hMemDC); |
| 803 | DeleteDC(hScrDC); |
| 804 | #endif /* !OPENSSL_SYS_WINCE */ |
| 805 | } |
| 806 | |
| 807 | #endif |